One stock argument deployed by anticircumcisionists is their contention that Jews changed the procedure in the 2C AD, implementing a more radical excision. Prior to that time, circumcision didn’t expose the glans. In other words, modern Jewish circumcision isn’t the same as (or comparable to) OT circumcision. So goes the argument.
I have reservations about nonspecialists who think they can jump straight into the Mishnah, Talmud, and Tosefta. These are often obscure documents that require a lot background knowledge to appreciate the context.
According to this article (see below), rabbinic Judaism did not alter the traditional procedure. Rather, some Jewish assimilators were shirking the traditional procedure, and the Mishnah was merely reaffirming the traditional procedure. In other words, the traditional procedure did expose the glans. That’s not a later innovation.
Ironically, this article is posted on an anticircumcision website.